When a large geographical area is affected, humanitarian hubs and sub-national cluster coordination are often established for operational purposes and needs. Sub-national FSCs do not need to mirror the national structure. While FAO and WFP often are CLAs at both national and sub-national level, this may differ depending on the context e.g. lack of physical presence in affected area. In such cases, another organisation may act as cluster focal point and carry out the cluster tasks in a specific location (formalised through a Letter of Understanding (LOU) or other any other agreement). L/NAs should be prioritised for such leadership roles where possible. However, regardless, FAO and WFP as designated national-level CLAs remain accountable to the RC/HC for the effectiveness of the overall food security coordination and response. In some cases, more capacity and seniority are needed at sub-national level, close to operations, than at national level. Close linkage between national and sub-national level FSCs is critical for an effective FSC response (see 3.5.2. on the role of sub-national FSC Coordinator). In some countries, sub-national coordination may be undertaken through one national level “roving” Coordinator who actively supports humanitarian hubs at sub-national level.