Simplify the following text for a Grade 11 native English-speaking person.
Original: Lake Pontchartrain is a brackish estuary located in southeastern Louisiana .
Simplified: Lake Pontchartrain ( in English ; Lac Pontchartrain , IPA ( lak pÉ '' Ì Ê aÊ tÊ É Ì ) in French ) is a brackish lake located in southeastern Louisiana .