Land? Or your home?
The loss on sale of land held for investment purposes is deductible. Go to the section for Sales of Stocks, Bonds and other Property on the income page. Look for the most likely option, it may be "something else". Enter the requested information (purchase date, price, sell date, price, and anything else.)
If this was held for personal reasons (it was your private hunting land, you had a summer cabin there) then a loss is not deductible. You only need to report it if you got a 1099-S form at the closing. Report it in the same way, but don't expect a tax deduction from the loss.
