From CojsWiki
The map shows the distribution of Philistine pottery imports into Israel. The Philistine wares obviously spread out from the coastal plain, perhaps in the wake of political domination. The distribution of these wares was restricted, but others (like Cypriot and Phoenician products) became almost ubiquitous.
B.S.J. Isserlin. The Israelites. Thames and Hudson, London, 1998. p. 187.
