The most common answers for the crossword clue "deep ravine" include:

• GORGE (5 letters)
• CHASM (5 letters)
• CANYON (6 letters)
• ABYSS (5 letters)
• GHYLL (5 letters)
• GULF (4 letters)
• GULCH (5 letters)
• GAP (3 letters)
• BARRANCA (8 letters)

GORGE and CHASM appear to be the top likely solutions, both having 5 letters and frequently used for this clue.