This is more than just one site, and can best be dealt with under four main headings:-

Calblanque – SAT NAV 37°36.331’N 0°43.723’W
. This is the area of the south coast below La Manga Golf Club, with a ‘wild’ beach and an old saltworks. Excellent for migrants. A big cliff up on the right has a pair of Bonelli’s Eagles, and Ravens are about too. You can see almost anything here. Beware of car-theft!
Los Alcazares South (old airstrip and coastline) – SAT NAV 37°42.838’N 0°51.477’ This is a big, desolate area of ‘set-aside’ land just north of the village of that name. Always worth a look, it holds Lesser Short-toed Lark, is good in winter for a variety of larks and finches, as well as harriers. You may well find something else there!

Cabo de Palos (Mar de Cristal Salinas) – SAT NAV – N37 38°.282’W 0° 43.206’N A small saltworks just outside Cabo de Palos, reached from a complicated junction off the dual carriageway: Very good for Audouin’s & Slender-billed Gulls, as well as waders.
Cabo de Palos Lighthouse – SAT NAV 37°38.282’N0°43.206’W Can be a good spot for sea-watching in the right weather and the bushes below the lighthouse hold many small birds.
Other areas:-
El Carmoli (tarmacked sports pitch) – SAT NAV 37°41.622’N 0°50.747’W
Los Urrutias (Club de Regatas) – SAT NAV – 37°40.624’N 0°49.590’W