The coastal region of five allied Philistine cities (Gaza, Ashkelon, Ashdod, Gath, and Ekron) that repeatedly warred with Israel, especially during the judges period through Samson's conflicts with them (Judges 13-16) and their capture and forced return of the ark of the covenant (1 Samuel 4-6).
The Philistine Territory was the coastal land of five allied cities — Gaza, Ashkelon, Ashdod, Gath, and Ekron. The Philistines were Israel's frequent enemies, especially in the days of the judges. Samson fought them again and again, and it was the Philistines who once captured the ark of the covenant before God made them send it back.
References: Genesis 21:32; Judges 13-16; 1 Samuel 4-6
People connected to Philistine Territory
Samson(M) — raided and judged among the Philistines for twenty years
Judges 15:20
Saph(M) — a Philistine giant killed by David's man Sibbecai
2 Samuel 21:18
Shamgar(M) — struck down six hundred Philistines with an ox goad