Fort Pike
It was built following the War of 1812 to guard the Rigolets pass in Louisiana , a strait from the Gulf of Mexico , via Lake Borgne , to Lake Pontchartrain bordering New Orleans . 
<triplet> Rigolets <subj> Lake Pontchartrain <obj> origin of the watercourse <triplet> Louisiana <subj> Lake Pontchartrain <obj> located in or next to body of water <triplet> Lake Borgne <subj> Louisiana <obj> located in the administrative territorial entity <triplet> Lake Pontchartrain <subj> Louisiana <obj> located in the administrative territorial entity