See the entire entry for maḏbar, maḏbrā n.m. desert

TgO Ex3:1 :וְדַבַר יָת עָנָא לַאְתַר שְפַר רִעיָא : he led the flock to the the best place for pasturing

See the entire entry for šp̄ar, šup̄rā n.m./f. beauty; best part