Affection for tartan cloth crossed the Atlantic first with Scottish regiments, who served garrison duty in Canada before Confederation, and later with the Scottish immigrants who settled in the Maritimes and United Canada. District tartans reflect geographical areas and are the most relevant in Canada today. The Canadian tartans link land and community through symbolic and imaginative use of colour. The Maple Leaf tartan is the official national tartan of Canada designated in 2011. The colours represent the four colours of the maple leaf through the seasons: green in summer, gold in early autumn, red at first frost and brown when the leaf has fallen. Caribou, Nova Scotia has chosen a tartan that features the colour red, symbolic of its sunsets, lobsters and fire trucks. The Ontario Northern Canadian district tartan's grey, white, blue, gold, green and reddish-brown conjure up the nickel-bearing rock, the snow, the sky and lakes, the precious metal, the forests and fields and the Aboriginal peoples. Boucherville, Quebec's design, is based on the azure blue of loyalty, the silver grey of serenity, the gold of generosity, the green of hope and the white of purity and innocence. Saskatchewan's tartan boasts seven colours: gold signifies the prairie wheat, brown the summer fallow, green the forests, red the prairie lily, yellow the rapeseed flower and sunflower, white the snow and black the oil and coal.