training grounds; training area
Refers to a physical location used for training, such as military, sports, or professional practice facilities.
The Self-Defense Forces' training grounds are vast.
New firefighters conduct practical drills at the training area.
練習場 is a more general term for practice grounds, often used for sports or music, whereas 訓練地 carries a stronger nuance of systematic training, often in military or professional contexts.
Compound of 訓練 (training) and 地 (ground, land).