Marine Habitats

Enhancing management of ocean ecosystems that extend across state borders

Water Quality

Advancing regional-scale efforts for healthy, clean ocean waters

Climate Change Adaptation

Understanding impacts on marine ecosystems, coastal communities and economies

Renewable Energy

Planning for sustainable and compatible wind power in offshore waters.


MARCO is the Mid-Atlantic Regional Council on the Ocean, formed in 2009 by a governors’ agreement among New York, New Jersey, Delaware, Maryland, and Virginia.

MARCO Partnership Opportunities

MARCO’s 2022 – 2024 Work Plan

Mid-Atlantic Ocean Data Portal

The Portal is an ocean planning resource center featuring the Marine Planner, an interactive mapping tool.

Check out the latest Portal News & Updates!

Mid-Atlantic Committee on the Ocean

MACO is a committee established by MARCO to foster collaboration among states, federal agencies, the Mid-Atlantic Fishery Management Council, and federally recognized tribes, and to engage stakeholders.

MACO Updates

Upcoming MARCO Events & Webinars


Dates: May 13-14, 2024

Field Trip: May 15, 2024

Location: The Virden Retreat Center in Lewes, DE
Mid-Atlantic Ocean Forum Purpose:
The Forum is the region’s premier annual event dedicated to ocean planning, gathering ocean professionals and stakeholders representing federal and state agencies, Tribal entities, marine industries, nonprofit research and advocacy organizations, and the public.

Flyer reading: Online Webinar<br />
Chesapeake Carbon and Alkalinity Study<br />
Understanding the role of macrobiota in estuarine carbon and alkalinity dynamics in the Potomac River Estuary and the York River Estuary<br />
Raymond Najjar<br />
Pennsylvania State University<br />
April 24, 2024


Tune in April 24 as Dr. Raymond Najjar (Pennsylvania State University) provides an overview of the Chesapeake Carbon and Alkalinity Study, which is focused on improving understanding of the role that macrobiota play in estuarine carbon and alkalinity dynamics.


Recent MARCO Events & Webinars

Watch: Coastal and Ocean Acidification Data Webinar

The March 19 edition of the MARCO Portal’s “How Tuesday” webinar series provided a tour of the site’s recently expanded coastal and ocean acidification monitoring sites maps and an overview of acidification in the Mid-Atlantic.

MARCO Webinar: A dive into Sea Turtle Research Planning in Support of Impact Assessment for US Atlantic Offshore Wind


The MARCO Ocean Conservation Work Group hosted a webinar with a featured presentation by Dr. Susan Barco highlighting recommendations from the Sea Turtle Chapter of the Regional Wildlife Science Entity Science Plan.

MARCO 2022 Annual Report Published

We are excited to share a few of the things we are proud of in this report, from the fourth annual Mid-Atlantic Ocean Forum hosted in May, to the official formation of an Ocean Conservation Work Group, and the significant strides we’ve made in our commitment to Diversity, Equity, Inclusion, Justice, and Accessibility (DEIJA).

MARCO 2022 Annual Report

Woman and Child on Beach

Statement on Diversity, Equity, Inclusion, Justice, Accessibility

MACO is committed to listening and incorporating information from the widest possible set of stakeholders to better understand and address injustices and inequities. MACO will ensure its work reflects a commitment to Diversity, Equity, Inclusion, Justice and Accessibility (DEIJA), as well as addresses the needs of stakeholders from a variety of backgrounds and industries.