The Lanao provinces run from the Iligan Bay coast up to Lake Lanao on a high plateau. Here is what to screen at an exact address.
The two Lanao provinces cover very different ground. Lanao del Norte runs along Iligan Bay and the coastal lowland; Lanao del Sur sits inland and higher, around Lake Lanao on a plateau, with Marawi on its northern shore.
Iligan City is separate administratively and has its own post. What follows covers the rest.
Kolambugan, Tubod, Baroy, Lala, Kapatagan and the towns along Iligan Bay and the Panguil Bay side sit on low coastal ground fed by short rivers off the highlands.
Read together:
Sendong in December 2011 is the regional lesson event, and it applies to the whole stretch of coast, not only to Iligan.
Lake Lanao sits at altitude and drains north through the Agus River, which falls steeply toward Iligan Bay. That fall is why the river carries so much energy and why it has been developed for hydroelectric power.
For a property around the lake, screen flood susceptibility, elevation, and waterway distance as usual, and add one question a map cannot answer: lake level. Ask locally how much the lake rises in a wet year, and whether shoreline properties have been affected.
If your property is downstream of a dam or a regulated outflow, ask the operating agency and the provincial disaster office how releases are managed and warned. See living downstream of a dam.
Central and western Mindanao carry active faulting, and this region is not an exception. Read the distance from your coordinates to the nearest mapped active fault as a design input for a licensed structural engineer, not as a rating of the lot. The reasoning is in magnitude and intensity.
Read it alongside the liquefaction estimate for low, soft, saturated coastal ground.
The ground between the coast and the plateau is steep, and the road that connects them climbs through it. Read slope with mapped landslide susceptibility for anything on or below that terrain, and inspect cut slopes on the route. See cut slopes behind a house.
Parts of Lanao del Sur have been affected by conflict and displacement, and reconstruction in Marawi has been a long process. Those are not hazard questions and they bear directly on access, documentation, valuation, and what you can actually do with a property.
Verify current conditions locally and get legal advice on tenure before committing. A hazard screening has nothing to say about any of it, and pretending otherwise would be dishonest.
A hazard screening reads public national datasets at a point and reports mapped susceptibility, elevation, slope, and distances. It does not model lake levels, dam operations, or soil at depth, and it has nothing to say about tenure or security. The operating agency, the provincial disaster office, a licensed geotechnical engineer, and a Philippine lawyer cover what it cannot.
CheckHazard does not replace a professional geotechnical or engineering survey.