Illsee

{{Infobox lake

| name = Illsee

| image = Illsee - septembre 2022.jpg

| caption =

| image_bathymetry =

| caption_bathymetry =

| location = Sierre, Valais

| coords = {{coord|46|15|27|N|7|37|57|E|type:waterbody_region:CH-VS_source:dewiki|display=inline,title}}

| type = natural lake, reservoir

| inflow =

| outflow = Illbach

| catchment = {{convert|5.9|km2|abbr=on}}

| basin_countries = Switzerland

| length = {{convert|0.2|km|abbr=on}}

| width =

| area = {{convert|0.21|km2|abbr=on}}

| depth =

| max-depth = {{convert|64|m|abbr=on}}

| volume = {{convert|6.6|e6m3|acre.ft|abbr=out}}

| residence_time =

| shore =

| elevation = {{convert|2360|m|abbr=on}}

| islands =

| cities =

| pushpin_map=Canton of Valais#Switzerland#Alps

| pushpin_label_position= bottom

| pushpin_relief = y

| embedded = {{Infobox mapframe |wikidata=yes |zoom=15 |coord={{WikidataCoord|display=i}}}}

}}

__NOTOC__

Illsee is a natural lake used as a reservoir above Sierre, in the Valais, Switzerland. Its surface area is {{convert|0.21|km2|abbr=on}}.