lop: Atrial vw\xi of Enpwetak Atoll Trom an altitude of 10.000 ft looking north. The wide south passage to the lagoon is at the bottom of the pic- 

 ture. The three islands to the right of the passage are Enewetak, Medren, and Japtan. The deep east pass is seen between Medren and Japtan. The 

 five southwest islands are seen to the left of the wide south passage. Ikuren is the first one. North of these islands is the shallow southwest pass. The 

 Aldll is elliptical in shape measuring about 41 km from north to south and 33 km from cast to west. [Photography by P. L. Colin.] 



liiUtom: Aerial view of the northern end of Enewetak Island showing the cluster of buildings of the Mid-Pacific Research Laboratory. The quarry 

 is visible on the reef flat. The small island immediately to the north is Bokandretak. [Photography by E. S. Reese.] 



