Gandhamādana

One of the eight Boundary Mountain ranges in Jambūdvīpa, situated to the East of Mount Meru and separating Ilāvṛta-varṣa from Bhārata-varṣa.

Height
2,000 yojanas

Width
Not stated, or understood to be 2,000 yojanas

Length
Not stated precisely in Bhāgavatam, but explained that they extend from Nīla mountain range in the North to Niṣadha mountain range in the South, which would result in 34,000 yojanas.