"What is this thing?"
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Water is a substance found throughout the cosmos in Metroid. You may also be looking for:
Water, the substance
Acid, referred to as "water" in the Metroid manual and early media
Waterfall Cavern
Watery Hall Access
Watery Hall
Watering Hole
Water-purification system
Dark Water
Water-filled tank
Water Tank
Sector 4 (AQA), also referred to as the "Water Environment"
Beta Acid, also referred to as "dangerous water"