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Just west of Artupa village in Astara is the southern part of Hirkan National Park. The road to the park runs along the Iran border where a long stretch of barbed wire fencing and a guarded iron bridge in Iran are plainly visible. The guard will sometimes wave back to gawking tourists. At the end of the road are natural hot springs that merge with the river. Here you can alternately dip in the hot springs and the cold river.
Visit this interesting piece of coast where a long bridge enters the sea for the purpose of delivering oil back to the land from tankers. The local security will be more than happy to show you the bridge. Also the sea is very rough with strong winds, delivering a great experience and view.
Sanatorium/hotel, but you are probably better off with the hot springs near Lankaran.