evidence: Lake Nyasa, known as Lake Malawi by Malawians, has been the source of disagreements since colonial times, which were rekindled recently when Malawi allowed gas and oil exploration to begin around the lake's border. Rhetoric has escalated over the past few months although it seems both sides are now attempting to calm tensions. [...] Located at the junction of Malawi, Mozambique and Tanzania, Lake Nyasa – the eighth largest in the world – contains an estimated 168,000 tonnes of fish of nearly 1000 species, and is able to provide sustenance for nearly 600,000 people. In the early 1960s, Malawi's first president, Hastings Kamuzu Banda, claimed that Lake Nyasa was part of Malawi referring to 1890 Heligoland Agreement between Britain and Germany which stipulated that the border between the countries lay along the Tanzanian side of the lake. This treaty was reaffirmed at the 1963 Organisation of African Unity summit where it was accepted reluctantly by Tanzania although disputes reignited in 1967-8.