Prepare your canner and jars.
Peel the mandarin oranges & discard the peels. Separate the segments & carefully remove the pith.
Make a light syrup by combining the water and sugar in a saucepan over medium heat. Stir to dissolve. Keep warm, but do not boil.
When the syrup is ready, pack the mandarin segments into the jars. Pour in the syrup, leaving 1/2 inch of headspace.
Apply lids and rings, and process using a standard water bath canning process for 10 minutes