The Portuguese word for beach is
praia

Gender

The gender of praia is feminine. E.g. a praia.

The plural of praia is praias.

beach
1. Substantivo. praia, margem;
2. Substantivo. seixos, calhaus.
3. Verbo. puxar (um barco) para a praia;
4. Verbo. (naútica) abicar, pôr na praia, encalhar.

praia
1. n-f. beach (shore of a body of water, especially when sandy or pebbly)

abicar
1. v. to beach (run a watercraft aground)

encalhar
1. v. (nautical, of a vessel) to beach, strand, run aground
2. v. (figuratively) to find (an obstacle, hindrance, difficulty, etc.)
3. v. (informal) to fail to sell (a commodity)
4. v. (informal, especially of a woman) to be, become or remain unmarried or single