Plumas ([ˈplu.mäs]; Spanish for "feathers"), also known as New Holland (Dutch: Nieuw Holland, French: Nouvelle-Hollande), is a province in the northwestern region of Sierra. Plumas is the 8th largest and 6th most populous of the 23 provinces of Sierra. The province's capital is Ukiah while the largest city is New Rotterdam. It is ranked 5th in the order of admission into the Kingdom, being admitted on November 28, 1858, the inaugural day of the Kingdom of Sierra. It is the only second-level administrative region in the Kingdom to have Dutch as one of its official languages, and one of three PSALTs to include French as one.