evidence: Questions have been raised over Putrajaya's denial that its recent maritime agreements with Indonesia included the Ambalat block, a 15,000 sq km area at the heart of a territorial dispute off the coast of Sabah which is said to contain one of the biggest crude oil deposits in the world. [...] The tussle over Ambalat, which Malaysia refers to as Block ND6 and Block ND7, has seen minor clashes between Malaysia and Indonesia, with the issue often included during anti-Malaysian protests in Indonesia. [...] Indonesia has claimed ownership of the area by citing the Indonesia-Malaysia Continental Boundary Treaty signed in 1969 in Kuala Lumpur, despite the Ambalat block's location which borders directly with Malaysia. Malaysia later issued an official map which placed the Ambalat block in its territory.