Mozambique, officially the Republic of Mozambique ( or República de Moçambique, pron. ), is a country in southeastern Africa bordered by the Indian Ocean to the east, Tanzania to the north, Malawi and Zambia to the northwest, Zimbabwe to the west and Swaziland and South Africa to the southwest. It was explored by Vasco da Gama in 1498 and colonized by Portugal in 1505.