Sal and Teak trees belong to the tropical deciduous forests vegetation belt. Tropical deciduous forests are found in regions with a distinct wet and dry season. These forests typically have trees that shed their leaves during the dry season as a way to conserve water. Sal and Teak trees are common species in tropical deciduous forests.

Temperate forests, which is option 1, are found in regions with moderate temperature and a mix of coniferous and deciduous trees. Consequently, option 1 is incorrect.

Equatorial forests, or rainforests, are found near the equator and have a high level of rainfall throughout the year. Sal and Teak trees are not typically found in equatorial forests. Therefore, option 2 is incorrect.

Mixed forests, which is option 4, are a combination of coniferous and deciduous trees and are found in regions with varying climates. This option does not specifically mention tropical deciduous forests and thus is not the correct answer.

Therefore, the correct answer is option 3, tropical deciduous forests.