▁Category : C orn ish ▁culture ▁Category : C ult ural ▁her itage ▁of ▁Mexico ▁Category : P ach uca ▁Category : C orn ish ▁di as por a <0x0A> </s> ▁P lain ▁of ▁the ▁C ul - de - S ac ▁( , ▁also ▁known ▁as ▁the ▁C ul - de - S ac ▁P lain , ▁or ▁the ▁C ul - de - S ac ▁De pression ) ▁is ▁a ▁fert ile ▁low land ▁on ▁the ▁island ▁of ▁His p ani ola . ▁It ▁extends ▁from ▁sout he astern ▁H ait i ▁into ▁the ▁south western ▁Domin ican ▁Republic , ▁where ▁it ▁is ▁known ▁as ▁the ▁Ho ya ▁de ▁En ri qu illo . ▁ ▁Geography ▁Cover ing ▁an ▁area ▁of ▁ 2 8 ▁ 0 0 0   km ² ▁around ▁with ▁a ▁length ▁of ▁ 3 2   km ▁long ▁and ▁ 2 5   km ▁wide , ▁the ▁P lain ▁of ▁the ▁C ul - de - S ac ▁is ▁bounded ▁to ▁the ▁north ▁and ▁south ▁by ▁high ▁mountains ▁and ▁to ▁the ▁west ▁by ▁the ▁G ulf ▁of ▁Gon â ve ▁on ▁edges ▁of ▁which ▁is ▁the ▁H ait ian ▁capital ▁of ▁Port - au - Pr ince ▁and ▁to ▁the ▁Pla ine ▁de ▁l ' Ar c aha ie ▁that ▁extends ▁to ▁the ▁west . ▁The ▁P lain ▁of ▁the ▁C ul - de - S ac ▁extends ▁east ward ▁into ▁the ▁Domin ican ▁Republic . ▁ ▁This ▁valley ▁was ▁once ▁an ▁arm ▁of ▁the ▁sea ▁and