I. Introduction

1. In a letter dated 23 December 2013 (S/2013/759), the Security Council extended the mandate of the United Nations Office for West Africa until 31 December 2016 and requested me to submit a report every six months on the implementation of its mandate. Following my letter to the Council dated 14 January 2016 (S/2016/88) on the strategic review of the Office of my Special Envoy for the Sahel, the Council requested me, on 28 January 2016, to proceed with the merger of the two offices into the United Nations Office for West Africa and the Sahel (UNOWAS) and asked me to provide an update on the implementation of the mandate of UNOWAS in my next report (see S/2016/89). The present report covers the period from 30 July to 31 December 2016 and provides an overview of developments and trends in West Africa and the Sahel. It also outlines the activities of UNOWAS and the progress made in the implementation of the United Nations integrated strategy for the Sahel (S/2015/866).