ABSTRACT Seeking economic growth and job creation to tackle the nation’s extreme poverty, the Nicaraguan government awarded a concession to build an inter-oceanic canal and associated projects to a recently formed Hong Kong based company with no track record or related expertise. This concession was awarded without a bidding process and in advance of any feasibility, socio-economic or environmental impact assessments; construction has begun without this information. The 278-km long inter-oceanic canal project may result in significant environmental and social impairments. Of particular concern are: damage to Lake Cocibolca, a unique freshwater tropical lake and Central America’s main freshwater reservoir; damage to regional biodiversity and ecosystems; and socio-economic impacts. Concerned about the possibly irreparable damage to the environment and to native communities, conservationists and the scientific community at large are urging the Nicaraguan government to devise and reveal an action plan to address and mitigate the possible negative repercussions of this inter-oceanic canal and associated projects. Critical research needs are herein identified to inform a comprehensive benefit-cost assessment for this megaproject. Keywords: Nicaragua, interoceanic canal, HKND, environmental impacts, social impacts.