user: Question: When 312 is  of which currently forests, km² what is the land formation? 
Columns: ['land formation', 'area, km²', 'of which currently forests, km²', '% forests', 'habitat type']
Types: ['text', 'real', 'real', 'text', 'text']
Sample row: ['Northern Moldavian Hills', 4630.0, 476.0, '10.3%', 'forest steppe']
SQL:

assistant: SELECT "land formation" FROM "Table" WHERE "of which currently forests, km²" = 312.0;