The Katherine Visitor Information Centre, Lindsay Street at Katherine Terrace, Katherine, NT 0850 (tel. 1800/653 142 or 08/8972 2650; www.visitkatherine.com.au), has information on things to see -- not only all around Katherine, but as far afield as Kakadu National Park and the Kimberley. It's open daily from 8:30am to 5pm in the Dry season (Mar-Oct); in the Wet (Nov-Feb) it's open Monday through Friday from 9am to 5pm and on weekends and public holidays 10am to 2pm. Closed December 25 and 26, January 1 and Good Friday.
The Nitmiluk Visitor Centre, on the Gorge Road, 32km (20 miles) from town (tel. 08/8972 1886), dispenses information on the Nitmiluk National Park and sells tickets for gorge cruises, which depart outside. The center has maps; displays on the park's plant life, birds, geology, and Aboriginal history; a gift shop; and a cafe. It's open daily from 7am to 6pm, sometimes closing a little earlier in the Wet. Entry to the park is free.