The French wine region of Jura is located near the eastern edge of the country between Burgundy and the Swiss border. Its cool continental climate, which is influenced by the nearby alps, helps produce wines with high acidity and distinct mineral earthiness. Jura is home to some unique and unconventional wine styles such as vin jaune, which is a style of white wine made from the Savagnin Blanc grape that is produced similarly to Sherry - in that it is matured under Flor, or a layer of yeast, in old oak barrels that are never topped-up. Other popular varieties grown in Jura are Poulsard, Pinot Noir, Trousseau, and Chardonnay. Jura has a similar climate to Burgundy and can be extremely cold, especially in winter, and it is not uncommon for harvest take place very late in the year. Most vineyards here are located between the area's plains and mountains, and often have soils composed of marl and limestone. The most famous appellations in Jura are Arbois, Chateau-Chalon, L’Etoile, and the greatest wines grown here can become quite expensive.