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| English | Spanish |
| constantly flowing river | rio de caudal permanente |
| intermittently flowing river | rio de caudal intermitente |
| river birch | abedul de agua (Betula nigra) |
| river birch | abedul fluvial (Betula nigra) |
| river birch | abedul negro americano (Betula nigra) |
| river crayfish | cangrejo de río (Astacus pallipes, Austropotamobius pallipes(Lereboullet,1858)) |
| river maple | arce plateado americano (Acer dasycarpum, Acer saccharinum) |
| river margin ecosystem | ecosistema de las márgenes de los ríos |
| river mussel | mejillón de río (Pollicepes pictorum, Unio pictorum) |
| river prawns | langostinos de agua dulce (Macrobrachium) |
| river warbler | buscarla fluvial (Lucustella fluviatilis) |
| river with Glaucion flavi | rio con Glaucion flavi |
| sub-Alpine river | rio subalpino |
| sub-mountainous river | rio de zona premontañosa |