Lokacin da iska ta kasance a cikin ido, iska tana da kwanciyar hankali kuma ba tare da girgije ba, kodayake teku na iya zama mai tsananin tashin hankali. Idanun idon suna da zagaye a cikin tsari, kuma yawanci 30<unk>65 km (19<unk>40 mi) a diamita, kodayake an lura da idanu kamar ƙananan 3 km (1.9 mi) da kuma kamar 370 km (230 mi). Ana kiran gefen girgije na waje na ido "eyewall". Ganin ido yana fadada waje tare da tsawo, kama da filin wasan ƙwallon ƙafa; wannan abin da ake kira "stadium na farko".
cikin ciki