Austin residents are blessed with a plethora of fantastic outdoor spaces. To the northwest of the city in Hill Country lies Lake Travis, a reservoir where people enjoy fishing, boating, jet skiing, diving, and more activities. Closer to the city is the 351-acre Zilker Park, with picnic sites, botanical gardens, and outdoor theater. Bathers love Barton Springs, a spring-fed pool with year-round average temperatures of around 68 degrees Fahrenheit (20 degrees Celsius). Smack-bang in the center of Austin is Lady Bird Lake, a reservoir fed by the Colorado River. Locals come here for hiking, biking, and kayaking.