1. A geographical, academic, or professional region that has been thoroughly investigated and documented through comprehensive research
The Amazon rainforest is an extensively studied area in environmental science.
A floresta amazônica é uma área extensamente estudada na ciência ambiental.
2. A subject matter or field of knowledge that has received significant scholarly attention and analysis
Medieval European history is an extensively studied area in academia.
A história medieval europeia é uma área extensamente estudada na academia.