diff --git a/src/cartesian-chart/__tests__/cartesian-chart-series.test.tsx b/src/cartesian-chart/__tests__/cartesian-chart-series.test.tsx
index 1c85a573..95d4bd8c 100644
--- a/src/cartesian-chart/__tests__/cartesian-chart-series.test.tsx
+++ b/src/cartesian-chart/__tests__/cartesian-chart-series.test.tsx
@@ -18,7 +18,7 @@ const allSeries: CartesianChartProps.SeriesOptions[] = [
   { type: "line", name: "Line", data: [{ x: 1, y: 6 }], color: "5" },
   { type: "scatter", name: "Scatter", data: [{ x: 1, y: 7 }], color: "6" },
   { type: "spline", name: "Spline", data: [{ x: 1, y: 8 }], color: "7" },
-  { type: "bubble", name: "Bubble", data: [{ x: 1, y: 9, z: 5 }], color: "8" },
+  { type: "bubble", name: "Bubble", data: [{ x: 1, y: 9, size: 5 }], color: "8" },
   { type: "x-threshold", name: "X threshold", value: 1, color: "9" },
   { type: "y-threshold", name: "Y threshold", value: 9, color: "10" },
 ];
diff --git a/src/core/__tests__/chart-core-navigation-cartesian.test.tsx b/src/core/__tests__/chart-core-navigation-cartesian.test.tsx
index 1baea946..680c6a5a 100644
--- a/src/core/__tests__/chart-core-navigation-cartesian.test.tsx
+++ b/src/core/__tests__/chart-core-navigation-cartesian.test.tsx
@@ -2,11 +2,13 @@
 // SPDX-License-Identifier: Apache-2.0
 
 import highcharts from "highcharts";
+import Highcharts from "highcharts";
 import { range } from "lodash";
 import { vi } from "vitest";
 
 import { KeyCode } from "@cloudscape-design/component-toolkit/internal";
 
+import "highcharts/highcharts-more";
 import "highcharts/modules/accessibility";
 import { CoreChartTestProps, createChartWrapper, renderChart } from "./common";
 
@@ -56,6 +58,18 @@ const seriesShort3: Highcharts.SeriesOptionsType[] = [
     ],
   },
 ];
+const seriesShort4: Highcharts.SeriesOptionsType[] = [
+  ...seriesShort3,
+  {
+    type: "bubble",
+    name: "Bubble series 1",
+    data: [
+      { x: 1, y: 21, z: 31 },
+      { x: 3, y: 23, z: 32 },
+      { x: 4, y: 24, z: 33 },
+    ],
+  },
+];
 const seriesLong1: Highcharts.SeriesOptionsType[] = [
   {
     type: "line",
@@ -601,21 +615,26 @@ describe("CoreChart: navigation, cartesian charts", () => {
     const { wrapper } = renderChart({
       ...commonProps(),
       options: {
-        series: seriesShort2,
+        series: seriesShort4,
         xAxis: { title: { text: "X" }, valueFormatter: (value) => `x${value}` },
         yAxis: { title: { text: "Y" }, valueFormatter: (value) => `y${value}` },
       },
+      sizeAxis: { title: "Size axis", valueFormatter: (value) => `size${value}` },
     });
 
     focusApplication();
     keyDown(KeyCode.home);
 
     expect(describeFocusedElement()).toBe("button:x1[true,false]");
-    expect(wrapper.findTooltip()!.getElement().textContent).toBe("x1Line series 1y11Line series 2y21");
+    expect(wrapper.findTooltip()!.getElement().textContent).toBe(
+      "x1Line series 1y11Line series 2y21Line series 3y31Bubble series 1Yy21Size axissize31",
+    );
 
     keyDown(KeyCode.down);
 
     expect(describeFocusedElement()).toBe("button:x1 y11, Line series 1[true,false]");
-    expect(wrapper.findTooltip()!.getElement().textContent).toBe("x1Line series 1y11Line series 2y21");
+    expect(wrapper.findTooltip()!.getElement().textContent).toBe(
+      "x1Line series 1y11Line series 2y21Line series 3y31Bubble series 1Yy21Size axissize31",
+    );
   });
 });
diff --git a/src/core/chart-core.tsx b/src/core/chart-core.tsx
index 4a3bd816..adf28c27 100644
--- a/src/core/chart-core.tsx
+++ b/src/core/chart-core.tsx
@@ -213,7 +213,10 @@ export function InternalCoreChart({
       keyboardNavigation: options.accessibility?.keyboardNavigation ?? { enabled: !keyboardNavigation },
       point: {
         // Point description formatter is overridden to respect custom axes value formatters.
-        descriptionFormatter: (point) => getPointAccessibleDescription(point, labels),
+        descriptionFormatter: (point) =>
+          getPointAccessibleDescription(point, labels, {
+            sizeAxis: castArray(rest.sizeAxis as CoreChartProps.SizeAxisOptions[]),
+          }),
         ...options.accessibility?.point,
       },
     },
diff --git a/src/core/components/core-tooltip.tsx b/src/core/components/core-tooltip.tsx
index f2df00fe..877ccb19 100644
--- a/src/core/components/core-tooltip.tsx
+++ b/src/core/components/core-tooltip.tsx
@@ -16,7 +16,6 @@ import { ChartAPI } from "../chart-api";
 import { getFormatter } from "../formatters";
 import { BaseI18nStrings, CoreChartProps } from "../interfaces";
 import {
-  getBubbleSeriesSizeAxis,
   getPointColor,
   getPointId,
   getSeriesColor,
@@ -24,6 +23,7 @@ import {
   getSeriesMarkerType,
   isPointVisible,
   isXThreshold,
+  matchSizeAxis,
 } from "../utils";
 
 import styles from "../styles.css.js";
@@ -318,7 +318,7 @@ function getBubblePointDetails(item: MatchedItem, sizeAxis: readonly CoreChartPr
 
   // Size axis is a custom abstraction built to support bubble series title and formatter for z (size) values.
   // We match size axes by ID if provided, or take the first defined axis instead.
-  const matchedSizeAxis = sizeAxis.find((a) => a.id === getBubbleSeriesSizeAxis(item.point.series)) ?? sizeAxis[0];
+  const matchedSizeAxis = matchSizeAxis(sizeAxis, item.point.series);
   if (matchedSizeAxis) {
     // Highcharts bubble size is represented by point.z value, which is however not present in the internal point type -
     // so we take it from point's options instead.
diff --git a/src/core/utils.ts b/src/core/utils.ts
index 0c773a6f..887cae4a 100644
--- a/src/core/utils.ts
+++ b/src/core/utils.ts
@@ -368,11 +368,28 @@ export function getChartAccessibleDescription(chart: Highcharts.Chart) {
   return chart.options.lang?.accessibility?.chartContainerLabel ?? "";
 }
 
-export function getPointAccessibleDescription(point: Highcharts.Point, labels: ChartLabels) {
+export function matchSizeAxis(sizeAxis: readonly CoreChartProps.SizeAxisOptions[], series: Highcharts.Series) {
+  return sizeAxis.find((a) => a.id === getBubbleSeriesSizeAxis(series)) ?? sizeAxis[0];
+}
+
+export function getPointAccessibleDescription(
+  point: Highcharts.Point,
+  labels: ChartLabels,
+  additionalProps?: {
+    sizeAxis?: readonly CoreChartProps.SizeAxisOptions[];
+  },
+) {
   if (point.series.xAxis && point.series.yAxis) {
     const formattedX = getFormatter(point.series.xAxis)(point.x);
     const formattedY = getFormatter(point.series.yAxis)(point.y);
-    return `${formattedX} ${formattedY}, ${point.series.name}`;
+    let formattedSize = "";
+    if (additionalProps?.sizeAxis && point.series.type === "bubble") {
+      const matchedSizeAxis = matchSizeAxis(additionalProps.sizeAxis, point.series);
+      const size = point.options.z ?? null;
+      const sizeFormatter = getFormatter(matchedSizeAxis);
+      formattedSize = sizeFormatter(size);
+    }
+    return `${formattedX} ${formattedY}${formattedSize ? " " + formattedSize : ""}, ${point.series.name}`;
   } else if (point.series.type === "pie") {
     const segmentLabel = labels.chartSegmentLabel ? `${labels.chartSegmentLabel} ` : "";
     return `${segmentLabel}${point.name}, ${point.y}. ${point.series.name}`;