EXHIBIT 21.1
PAGE 1 OF 2
APACHE CORPORATION - LISTING OF SUBSIDIARIES
AS OF FEBRUARY 28, 2003
<Table>
<Caption>
EXACT NAME OF SUBSIDIARY AND NAME JURISDICTION OF
UNDER WHICH SUBSIDIARY DOES BUSINESS INCORPORATION OR ORGANIZATION
- ------------------------------------ ------------------------------
Apache Corporation (New Jersey) New Jersey
Apache Aviation, Inc. Delaware
Apache Delaware LLC Delaware
Apache Finance Louisiana Corporation Delaware
Apache Foundation Minnesota
Apache Gathering Company Delaware
Apache Holdings, Inc. Delaware
Apache International, Inc. Delaware
Apache North America, Inc. Delaware
Apache Finance Pty Limited Australian Capital Territory
Apache Australia Management Pty Limited Victoria, Australia
Apache Australia Holdings Pty Limited Western Australia
Apache Qarun Corporation LDC Cayman Islands
Apache Louisiana Holdings, LLC Delaware
Apache Louisiana Minerals, Inc. Delaware
Apache Overseas, Inc. Delaware
Apache Abu Gharadig Corporation LDC Cayman Islands
Apache Argentina Corporation LDC Cayman Islands
RME Argentina S.A. Argentina
Apache Asyout Corporation LDC Cayman Islands
Apache Bohai Corporation LDC Cayman Islands
Apache China Corporation LDC Cayman Islands
Apache Darag Corporation LDC Cayman Islands
Apache East Bahariya Corporation LDC Cayman Islands
Apache Enterprises LDC Cayman Islands
Apache Faiyum Corporation LDC Cayman Islands
Apache FC Argentina Company LDC Cayman Islands
Apache Matruh Corporation LDC Cayman Islands
Apache Mediterranean Corporation LDC Cayman Islands
Apache North Sea Limited United Kingdom
Apache Poland Holding Company Delaware
Apache Eastern Europe B.V. Netherlands
Apache Poland Sp. z o.o. Poland
Apache South Umbarka Corporation LDC Cayman Islands
Apache Umbarka Corporation LDC Cayman Islands
Apache Oil Corporation Texas
Apache Topwater, LLC Delaware
Apache Clearwater, Inc. Delaware
Clearwater Interests, LLC Delaware
Apache Topwater Operations, LLC Delaware
Apache Clearwater Operations, Inc. Delaware
Burns Manufacturing Company Minnesota
</Table>
Page 2 of 2
APACHE CORPORATION - LISTING OF SUBSIDIARIES
AS OF FEBRUARY 28, 2003
<Table>
<Caption>
EXACT NAME OF SUBSIDIARY AND NAME JURISDICTION OF
UNDER WHICH SUBSIDIARY DOES BUSINESS INCORPORATION OR ORGANIZATION
- ------------------------------------ ------------------------------
Apache Energy Limited Western Australia
Apache Northwest Pty Ltd. Western Australia
Apache Carnarvon Pty Ltd. Western Australia
Apache Dampier Pty Ltd. Western Australia
Apache East Spar Pty Limited Western Australia
Apache Harriet Pty Limited Victoria, Australia
Apache Kersail Pty Ltd Victoria, Australia
Apache Miladin Pty Ltd Victoria, Australia
Apache Nasmah Pty Ltd Victoria, Australia
Apache Oil Australia Pty Limited New South Wales, Australia
Apache Airlie Pty Limited New South Wales, Australia
Apache Varanus Pty Limited Queensland, Australia
Apache Pipeline Pty Ltd Western Australia
Apache West Australia Holdings Limited Island of Guernsey
Apache UK Limited England and Wales
Apache Lowendal Pty Limited Victoria, Australia
Apache Transfer Company Delaware
DEK Energy Company Delaware
DEK Energy Texas, Inc. Delaware
DEK Exploration Inc. Delaware
Apache Finance Canada Corporation Nova Scotia, Canada
Apache Canada Management Ltd Alberta, Canada
Apache Canada Holdings Ltd Alberta, Canada
Apache Canada Management II Ltd Alberta, Canada
DEK Petroleum Corporation Illinois
Apache Canada Ltd. Alberta, Canada
Apache Canada Properties Ltd. Alberta, Canada
Apache FC Capital Canada Inc. Alberta, Canada
Apache FC Canada Enterprises Inc. Alberta, Canada
DEPCO, Inc. Texas
Heinold Holdings, Inc. Delaware
GOM Shelf, LLC Delaware
Phoenix Exploration Resources, Ltd. Delaware
TEI Arctic Petroleum (1984) Ltd. Alberta, Canada
Texas International Company Delaware
Apache Khalda Corporation LDC Cayman Islands
Apache Qarun Exploration Company LDC Cayman Islands
Nagasco, Inc. Delaware
Apache Marketing, Inc. Delaware
Apache Transmission Corporation - Texas Texas
Apache Crude Oil Marketing, Inc. Delaware
Nagasco Marketing, Inc. Delaware
</Table>