Grenzaa

{{Infobox river

| name =Grenzaa (German)
Schoonebeker Diep (Dutch)

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| source1_elevation = {{convert|20|m|abbr=on}}

| source1_coordinates = {{coord|52|35|25|N|7|07|05|E|region:DE-NI_type:waterbody_source:kolossus-dewiki|display=inline}}

| mouth_location =

| mouth_coordinates = {{coord|52.6501|6.7725|region:DE|display=it}}

| progression = {{RVechte}}

| subdivision_type1 = Countries

| subdivision_name1 = Germany and Netherlands

| subdivision_type2 = State

| subdivision_name2 = Lower Saxony

| subdivision_type3 = Province

| subdivision_name3 = Drenthe

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| mouth_elevation = {{convert|9|m|abbr=on}}

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Grenzaa or Schoonebeker Diep is a river on the border of Lower Saxony, Germany and Drenthe, Netherlands, near the town Twist. It forms some of the border between the Netherlands and Germany.{{Cite web |last=Schouten |first=Greetje |date=2022-06-01 |title=De loop van het Schoonebeker Diep door de tijd |url=https://www.rtvdrenthe.nl/nieuws/14699165/de-loop-van-het-schoonebeker-diep-door-de-tijd |access-date=2024-11-29 |website=www.rtvdrenthe.nl |language=nl}} Through the Coevorden-Piccardie-Kanal and the Coevorden-Vechtkanaal it discharges into the Vechte near Coevorden.