SH2-170 is a young, nearly circular, diffuse H-II region ionized by a single O main sequence star and located near the periphery of a small, dense molecular cloud. Based on the thermal continuum emission, the mass of the ionized gas within a radius of ∼7 pc is estimated to be 350 solar masses. The H-I (λ 21 cm) and far-infrared observations show an extended low-density atomic component of ∼1000 solar masses within an irregular boundary surrounding the ionized gas with a mean radius of ∼10 pc. The CO emission shows a molecular cloud of ∼1150 solar masses in an area of 6 pc × 4 pc. A compact infrared component coincides with the cloud. The exciting 10 mag star (LS I +64 11) is on the near side of the cloud, just inside the southern periphery. It is a member of the small open star cluster Stock 18. Estimated distances range from 2.8 kpc to 5.8 kpc.
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