Cașin (Râul Negru)

{{Infobox river

| name = Cașin

| native_name =

| native_name_lang =

| name_other =

| name_etymology =

| image =

| image_size =

| image_caption =

| pushpin_map = Romania

| subdivision_type1 = Country

| subdivision_name1 = Romania

| subdivision_type2 = Counties

| subdivision_name2 = Harghita, Covasna

| subdivision_type3 = Cities

| subdivision_name3 = Târgu Secuiesc

| length = {{convert|54|km|abbr=on}}

| width_min =

| width_avg =

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| depth_min =

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| depth_max =

| discharge1_location=

| discharge1_min =

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| source1 =

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| source1_coordinates=

| source1_elevation =

| mouth = Râul Negru

| mouth_location =

| mouth_coordinates = {{coord|45.9810|26.1678|display=inline,title}}

| mouth_elevation =

| progression = {{RRâul Negru}}

| river_system =

| basin_size = {{convert|482|km2|abbr=on}}

| tributaries_left =

| tributaries_right = Turia

| custom_label =

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}}

The Cașin is a right tributary of the river Râul Negru in Romania.{{GeoSource|RO|Annex7|652}}{{GeoSource|RO|Atlas|268-269|VIII.1.45.8}} It discharges into the Râul Negru in Catalina.[http://www.e-calauza.ro/index.php?afiseaza=pluta_noua&rau=1446 Casin (jud. Covasna)], e-calauza.ro It flows through the villages and towns Plăieșii de Sus, Plăieșii de Jos, Iacobeni, Valea Seacă, Sânzieni, Târgu Secuiesc and Catalina. Its length is {{convert|54|km|abbr=on}} and its basin size is {{convert|482|km2|abbr=on}}.{{GeoSource|RO|Atlas|268-269|VIII.1.45.8}}