What part of the British Mandate of Palestine was proclaimed as a Jewish national state in 1948?

The areas that were legally purchased by the Jewish National fund and other organizations later became Israel. These were areas of swampland and desert, which were made habitable by the early Jewish immigrants. It contained most of the west coast, from the Negev in the south, to Haifa in the north.

A map can be found at the below link.
Israel.