The Thames Veil (Stretch of tunnels beneath the river from Tower Bridge to Southwark)

[Kaimuund]

Nature: Ancient catacombs and mystical barrier.
Vampire Use: Refuge for the Crimson Guard; patrol routes between havens.
Mage Use: The Collegium uses it as a wardline to keep spirits from crossing into the city.
Conflict Hook: Something beneath the river has begun feeding on vitae and mana alike — and both sides are losing people to it.