Elter Water

{{Short description|Lake in Cumbria, England}}

{{about|the lake|the village|Elterwater}}

{{Use dmy dates|date=April 2022}}

{{Infobox body of water

| name = Elter Water

| image = Elterwater and Langdale.jpg

| caption = Elter Water with the Langdale Pikes in the background

| image_bathymetry =

| caption_bathymetry =

| pushpin_map = United Kingdom Lake District#United Kingdom South Lakeland

| pushpin_label_position =

| pushpin_map_caption = Location in the Lake District National Park##Location in South Lakeland, Cumbria

| location = Lake District, Cumbria

| coords = {{coord|54.427469|-3.025875|region:GB_type:waterbody|display=inline,title}}

| type = Tarn

| inflow = River Brathay, Langdale Beck

| outflow = River Brathay

| catchment =

| basin_countries = United Kingdom

| length = {{convert|1030|yd|m|abbr=on}}

| width = {{convert|350|yd|m|abbr=on}}

| area = {{convert|0.06|sqmi|abbr=on}}

| depth =

| max-depth = {{convert|20|ft|abbr=on}}

| volume =

| residence_time =

| shore = {{convert|2.9|km|abbr=on}}

| elevation = {{convert|187|ft|abbr=on}}

| islands = 2

| cities =

}}

Elter Water is a small lake in the Lake District in North West England, half a mile southeast of the village of the same name. It has a length of {{Convert|0.62|mi|km}}, maximum width of approximately {{Convert|0.24|mi|km}}, a maximum depth of {{Convert|7|m|yd}}, and an area of {{Convert|0.16|km2|sqmi}}. Its outflow is the River Brathay, which flows south to join Windermere near Ambleside. Windermere is itself drained by the River Leven, which flows into Morecambe Bay. The lake is in the unitary authority of Westmorland and Furness and the ceremonial county of Cumbria.

Elter Water forms part of the boundary between the historic counties of Lancashire and Westmorland, and is the northernmost point of the former.