Only requires a runway of 1 tile in the adjacent room.

Entrance condition:

{
  "comeInJumping": {
    "speedBooster": "any",
    "minTiles": 1
  }
}

Requires:

"canCrossRoomJumpIntoWater"

Dev note: This can be done with a shorter runway (closed end) and canMomentumConservingTurnaround, but that type of connection doesn't exist.