Castro Marim and Vila Real de Santo António Marsh Natural Reserve

Castro Marim and Vila Real de Santo António Marsh Natural Reserve (Portuguese: Reserva Natural do Sapal de Castro Marim e Vila Real de Santo António) is a natural reserve in Portugal. It is one of the 30 areas which are officially under protection in the country.

Protected areas of Portugal

National park	Peneda-Gerês

Natural parks	Alvão Arrábida Guadiana Valley International Douro International Tagus Montesinho Northern Littoral Ria Formosa Serra da Estrela Serra de São Mamede Serras de Aire e Candeeiros Sintra-Cascais Southwest Alentejo and Vicentine Coast

Natural reserves	Arzila Bog Berlengas Boquilobo Bog Castro Marim and Vila Real de Santo António Marsh Sado Estuary Santo André and Sancha Lagoons São Jacinto Dunes Serra da Malcata Tagus Estuary

Protected landscapes	Azibo Reservoir Bertiandos and São Pedro de Arcos Lagoons Corno do Bico Costa da Caparica Fossil Cliff Serra de Montejunto Serra do Açor

Coordinates: 37°12′28″N 7°26′37″W / 37.2077°N 7.4436°W / 37.2077; -7.4436