Lumbridge Basin

The Lumbridge Basin is a body of water that lies between Tutorial Island, Lumbridge Swamp, and the Kharidian Desert. It is fed by the River Lum, flowing through Lum Lagoon to the north-east, and connects to the Bay of Sarim to the north-west. To the south, it is connected to the Kharidian Sea.

A stepping stone located at the mouth of Lum Lagoon serves as an Agility shortcut between the Lumbridge Swamp and Kharidian Desert, requiring 66 Agility to cross.

Charting activates reward various amounts of Sailing experience, with significant bonus experience for completing every charting task in any given sea or ocean. Furthermore, full completion of all 5 charting tasks grants an additional 190 experience for a total of 510 Sailing experience.

Level	Type	Task	Sea	Ocean	Location	Comp%
1	Generic	Find a treacherous rock formation south of Lumbridge Swamp.	Lumbridge Basin	Ardent Ocean	Map	55.4%
1	Generic	Find an unfortunate corpse on a small island south east of Tutorial Island.	Lumbridge Basin	Ardent Ocean	Map	56.6%
1	Spyglass	Use your spyglass to get a good view of the western mine in Lumbridge Swamp from the south.	Lumbridge Basin	Ardent Ocean	Map	55.2%
12	Crate	Find a Sealed crate in the Lum Lagoon and sample the contents. Note: A raft is recommended but not required to reach this location.	Lumbridge Basin	Bonus charts	Map	32.5%
22	Current	Test the currents west of the Lum Lagoon.	Lumbridge Basin	Bonus charts	Map	35.8%

• 20 March 2025 - 26 March 2025 (March 2025 Sailing Alpha)

• In the March 2025 Sailing Alpha, this area of ocean was named "The Firth of Lum", but it was renamed in the June 2025 Sailing Beta.