Kudumbimalai is a region in the West of Batticaloa District

Batticaloa District

Batticaloa district is one of the 25 administrative districts of Sri Lanka. The district is administered by a District Secretariat headed by a District Secretary appointed by the central government of Sri Lanka. The headquarters is located in Batticaloa town...

, Sri Lanka. It consists a rock formation and a thick jungle. This area is very close to Polonnaruwa District

Polonnaruwa District

Polonnaruwa is a district in North Central Province, Sri Lanka. Its area is 3,403 km²....

 border.

Kudumbimalai in Tamil

Tamil language

Tamil is a Dravidian language spoken predominantly by Tamil people of the Indian subcontinent. It has official status in the Indian state of Tamil Nadu and in the Indian union territory of Pondicherry. Tamil is also an official language of Sri Lanka and Singapore...

 translates to Hair-knot-rock. Other Tamil

Tamil language

Tamil is a Dravidian language spoken predominantly by Tamil people of the Indian subcontinent. It has official status in the Indian state of Tamil Nadu and in the Indian union territory of Pondicherry. Tamil is also an official language of Sri Lanka and Singapore...

 name for this region is Thoppikkal, it translates to Hat-Rock, hence in Sinhala it is called Thoppigala.
British colonist from the past named this rock Baron's Cap.