Only available when the unofficial expansion, Horn of the Abyss, is installed.Observation Tower is an adventure map location that only appears in the water. It removes shroud within a 20 tile radius around the tower when it's visited. Even areas clouded by a Cover of Darkness will be revealed, though they will be overclouded again at the beginning of the next day.
Map revealing and scouting range modifiers
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| Map objects | Redwood Observatory • Pillar of Fire • Hut of the Magi • Eye of the Magi • Cartographer • Observation Tower   • Observatory • Ruins • Cover of Darkness
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| Artifacts | Spyglass • Speculum | |
| Town buildings | Lookout Tower • Skyship • Cover of Darkness | |
Water objects
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| Creature banks | Derelict Ship • Shipwreck • Beholder's Sanctuary • Temple of the Sea
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| Collectibles | Flotsam • Ocean Bottle • Sea Chest • Shipwreck Survivor • Jetsam • Pandora's Box • Sea Barrel • Vial of Mana
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| Special objects | Favorable Winds • Boat • Buoy • Cartographer • Mermaids • Sirens • Whirlpool • Altar of Mana • Observation Tower • Observatory • Seafaring Academy
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| Water versions of regular objects |
Border Gate • Border Guard • Quest Gate • Quest Guard • Fountain of Youth • Garrison • Pandora's Box • Prison • School of Magic • Seer's Hut • Shrines • Tavern • Two Way Sea Portal
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