Block from U+0D80 to U+0DFF. This block was introduced in Unicode version 3.0 (1999). It contains 90 codepoints.
The Wikipedia provides the following information on block Sinhala:
Sinhala is a Unicode block containing characters for the Sinhala and Pali languages of Sri Lanka, and is also used for writing Sanskrit in Sri Lanka. The Sinhala allocation is loosely based on the ISCII standard, except that Sinhala contains extra prenasalized consonant letters, leading to inconsistencies with other ISCII-Unicode script allocations.